You have twelve hundred connections on LinkedIn. Former colleagues, customers, partners, people from three or four companies. If you went through that list honestly today and asked who you could call tomorrow without it feeling awkward, you would probably end up with five names. You haven't written to the others in years, and now that you need something, you don't want to sound desperate. So you don't write at all.

This article shows how to reactivate a cold LinkedIn network in five steps, and how to reconnect with old contacts so they are actually glad to hear from you. I'm Jan Nordh, founder of Nordh Executive Search. For 19 years I have filled sales and senior roles at cybersecurity, enterprise software, AI and data center vendors across DACH and the Nordics. Before that I spent 25 years in enterprise sales myself, so I know both sides of the table.

Why does a cold network cost you roles?

Most good salespeople did not look after their network while they were chasing their number. That is normal. After three years of quarter ends, few people have the headspace for old colleagues. The question is what to do once the network has already gone cold.

I find it more useful to think of a network as a memory than as an address book or a stock of favours. When a role opens, someone asks: who do I know who has solved this kind of problem before? The names that come to mind in that moment get discussed first. That doesn't replace performance, but it decides whose performance gets looked at at all.

I see this in almost every new search. In the briefing with the hiring manager I ask: do you already have someone in mind? Almost always, two or three names come up. One case, anonymised: a regional vice president at an American security vendor, building a second enterprise team in Germany, gave me three names. He hadn't spoken to two of them in years. One had sent him a short message after his move, congratulating him and recalling a rollout they had done at a utility. The other he had run into at an event.

Then he said something I hear all the time: there was another one, at a competitor back then, really strong, but no idea where he is now. On paper, that third person may have been the best of the three. He still wasn't on the list. Nobody thought badly of him. The memory of him had simply stopped at an old point in time. By the time I reached him through the regular search, the hiring manager had already held his first conversations with the two people who had come to mind.

Why do most reconnect messages on LinkedIn fail?

Most messages to old contacts are written to be as safe as possible. "It's been a while, we should grab a coffee sometime." Nothing happens. Or the public version: a post saying you are open to new opportunities. Not much happens there either. I explain why in my article on the #OpenToWork banner.

Politeness is fine. The problem is that a message like this gives the other person nothing to respond to. It doesn't remind them what you worked on together, what you were good at, or why you are getting in touch right now.

You know this from your own territory. Think of an account you haven't touched in three years. No good account executive calls and asks whether there's any need. He looks for a trigger: a new CISO, an acquisition, an incident in their industry. With a trigger, the first call has a reason, and the customer listens. With their own network, many salespeople do the opposite. No trigger, no shared memory, and by the second sentence they are asking about a job. You wouldn't let anyone on your team get away with that.

How to reactivate a cold LinkedIn network in five steps

1. Start with a real reason to get in touch

Begin with the reason this person came to mind right now. They posted something, their company announced something, they changed roles, or a piece of industry news reminds you of a project you did together. You are not inventing a pretext. You are using the reason that already exists.

For that, you need to know what you actually did with this person. A simple career inventory helps: write down your deals, projects and customers from the last few years, and you will find a line for almost every name. The customer you shared. The proof of concept that nearly fell over. The quarter end when everyone sat over the contract until midnight. That one line decides whether your message gets read or dismissed. The same inventory also strengthens your profile, as I describe in the four levers that make recruiters notice your LinkedIn profile.

2. Send a first message with no ask

No request for a referral, no introduction, no "let me know if you hear of anything." Just a few human sentences, for example:

"Saw that you're running the partner business now. It took me straight back to that rollout at the insurer, the night we rescued the migration at the last minute. How are things going?"

That message follows a simple pattern: memory, observation, question. Then apply what I call the fifty-people test: if you could send this exact message to fifty people, it isn't personal enough.

A note for DACH: du or Sie?

In Germany, Austria and Switzerland, there is an extra layer: the informal du or the formal Sie. In Sweden the question hardly exists, everyone is du. In the German-speaking markets it matters. Between sales colleagues, first names are usual. With a former customer at a bank or a large corporate, you may well have been on formal terms. Stay with whatever you used back then. A sudden switch to the informal after five years claims a closeness that has to be rebuilt first.

3. Reply to what they actually wrote

When they answer, respond to what they said. Ask about their move, their team, their market. You know this from discovery: whoever opens the slide deck two minutes into a first meeting has lost the meeting. Two friendly messages followed by a CV in the attachment reads like an automated sequence, and everyone notices. You are rebuilding a relationship with someone who once knew your work.

4. Share your direction once the conversation is warm

When the exchange is warm, or it turns into a real call, say where you are heading. Calmly, for example: "I'm looking at where my experience selling platforms into the mid-market could make the biggest difference next." No long explanation, no apology, no dramatic story about the last reorganisation. Wanting a change is nothing a salesperson needs to justify. You don't have to hide your job search. It just shouldn't be the first thing the other person reads from you. Good referrals happen after someone understands where you want to go.

5. Match the ask to the relationship

Only once there is real context do you ask for something, and you ask for what the relationship can carry today:

• A former manager who knows you well: what's your honest read on me?

• A close colleague from back then: who would you talk to if you were in my position?

• Someone at your target company: does this role really fit my profile, or are they looking for something else?

• A looser connection: one specific question about their company.

• A former customer: which vendors are impressing you at the moment?

Salespeople often forget that last group. A CISO or head of IT you sold to years ago sees every week which vendors come knocking, who convinces and who is just loud. Asking them about the market is a conversation between equals, and it reminds them how you worked with them. A referral isn't the first goal. You are giving someone the chance to remember your work, and the referral often follows, because now they know what they would be referring you for.

What does a warm network look like from the headhunter's side?

The same applies to your relationship with headhunters, in both directions. One example, anonymised: an account executive I placed with a security vendor sent me a short note after his probation period, on what was going well and what was different from what he had expected. A year later his vice president needed two more people. He gave him my name. That became a search, and the search became two hires.

For him, it paid off twice. Internally, he was the one who had solved a problem for his boss. And when his company restructured a few years later, I called him before he had started thinking about a move, with a role that was never advertised. When I take on a new search, I start with the people who come to mind. If someone last got in touch four years ago, that is the version of them I have in my head.

What should you do this week?

• Write down ten names. Ten people you actually worked with, each with one line about what you did together.

• Message three of them without an ask. Memory, observation, question, and check each message against the fifty-people test.

• Start now, not in December. At many vendors, planning for next year happens in the autumn: headcount gets negotiated and territories get redrawn. If you are back on someone's mind now, you are the one a hiring manager thinks of when roles are released in the new year. In December the mass season's greetings arrive anyway, and none of them pass the fifty-people test.

The bottom line

A cold network is rarely a bad network. The people in it haven't written you off. They are just missing a current reason to think of you. You can give them one this week, in three sentences, with a memory of the work you did together. Someone who trusted you back then usually just needs a reason to do it again.

FAQ: reactivating a cold LinkedIn network

How do I reconnect with someone on LinkedIn after years without contact?

Start with a real trigger, such as a role change, a company announcement or a post, and connect it to a specific memory of work you did together. Keep the first message short, end with a genuine question, and do not ask for anything. If the same message could go to fifty people, rewrite it.

What should a message to a former colleague or customer say?

Use three parts: a memory of a shared project, an observation about what they are doing now, and a question about how it is going. For former customers, a market question works well, for example which vendors are impressing them at the moment.

Should I tell old contacts that I am looking for a new job?

Yes, but not in the first message. Share your direction once the conversation is warm, in one calm sentence about where your experience could make the biggest difference next. Then match any request to the strength of the relationship, from honest feedback with a former manager to one specific question for a looser contact.

Planning your next move in IT sales?

Nordh Executive Search places sales and leadership talent with cybersecurity, enterprise software, AI and data center vendors across DACH and the Nordics. If you are planning your next step, get in touch on LinkedIn or via nordh.de.